Readout Circuit for Fingerprint Sensing in Display Devices
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Solution Overview
Problem
Current display devices lack an efficient method for integrating fingerprint detection capabilities, which is essential for enhanced user authentication and security features in various applications.
Innovation Solution
A display device is designed with a combination of a light emitting element and a light sensing element, along with a readout circuit that generates switching signals to convert sensing signals from the sensor into fingerprint sensing signals, utilizing a scan control signal that includes a scan start signal and a clock signal to drive the pixel and sensor for fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device integrates fingerprint detection functionality, then user authentication capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the fingerprint sensing function with the existing display device structure by integrating a sensor layer with light sensing elements into the display panel. The sensor layer is combined with the pixel structure, allowing the display device to perform both display and fingerprint detection functions using shared components and circuitry.
Solution Approach 2:
The display device is designed with multi-functionality by enabling the same hardware structure to serve dual purposes: the light sensing elements in the sensor layer detect both display-related light and fingerprint patterns, while the readout circuit processes signals for both display operation and authentication functions.
2Measurement precision
If additional hardware is added for fingerprint detection, then fingerprint recognition accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The display device uses its own existing light emitting and sensing capabilities to perform fingerprint detection without requiring completely separate dedicated hardware. The light emitting elements illuminate the fingerprint area, and the light sensing elements detect the reflected light patterns, allowing the display device to serve its own authentication needs using integrated components.
Solution Approach 2:
The patent achieves fingerprint detection by changing the operational parameters of existing components - the light sensing elements are configured to detect specific wavelength ranges and intensity patterns that correspond to fingerprint ridges and valleys, while the readout circuit applies specific signal processing parameters to extract fingerprint information from the sensed light patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables effective fingerprint detection, improving user authentication and security by integrating fingerprint recognition directly into the display device without the need for additional hardware, enhancing security and user experience.
Implementation Method 1
a sensor including a light sensing element
Data Source
AI summary
A display device is disclosed that includes a display panel, a scan driver, a panel driving circuit, and a readout circuit. The display panel includes a pixel that includes a light emitting element and a sensor that includes a light sensing element. The scan driver outputs a scan signal for driving the pixel and the sensor in response to a scan control signal. The panel driving circuit outputs the scan control signal. The readout circuit generates switching signals based on the scan control signal and outputs a fingerprint sensing signal corresponding to a sensing signal received from the sensor in response to the switching signals.